- [Narrator] In the Sahara Desert.

- [Narrator] Fossils are everywhere, telling you what life looked like 30 million years ago.

- [Narrator] An incredible discovery.

- [Narrator] We have a complete skeleton.

- [Narrator] May reveal the origins.

- [Narrator] Of the prehistoric whale that lived here long time ago.

- [Narrator] Of the world's largest mammals.

- This is so awesome.

They're doing everything mammals do, but in the water.

- [Narrator] "When Whales Could Walk" on NOVA.

(majestic music)

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